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I bought a water-injection kit from JC Whitney 30 years ago. I installed it on a '76 Ford 500 with a 351 CID V-8 that I used to tow a travel trailer. I got the kit because I really worked that Ford towing up the mountains, and I was doing everything I could to prevent preignition knock when under heavy load using regular unleaded.
The water injector had a vacuum switch that activated a small pump to inject water into the carburetor when the vacuum got low, about 4 inches of mercury as I recall. I wired a light to tell me when the pump was activated.
It worked, although I cannot say how effective it really was. I certainly did not notice any increase in fuel mileage. But I got my $50 worth of entertainment out of it, which was what it cost.
I think it was built by Spearco.
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